Add toggle visibility to password (#938)

## What are the changes about?

I have add a keybinding to toggle the visibility of the password

## What existing issue does this resolve?

N/A

## Pre-requisites

- [x] I have tested & confirmed the changes work locally

Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/938
Reviewed-by: AnErrupTion <anerruption+codeberg@disroot.org>
Co-authored-by: Luna <luna-39@noreply.codeberg.org>
Co-committed-by: Luna <luna-39@noreply.codeberg.org>

src/tui/components/Text.zig

@@ -96,6 +96,10 @@ pub fn clear(self: *Text) void {
     self.visible_start = 0;
 }
 
+pub fn toggleMask(self: *Text) void {
+    self.masked = !self.masked;
+}
+
 pub fn handle(self: *Text, maybe_key: ?keyboard.Key, insert_mode: bool) !void {
     if (maybe_key) |key| {
         if (key.left or (!insert_mode and (key.h or key.backspace))) {